Nice wee game! The boss was simple yet interesting to fight as the player has to decide between dealing as much damage as possibly to the boss and potentially risking taking damage, or to send the boss back to the blue window room but deal less damage in the process. The controls are very simple and intuitive as there's only 2 buttons and the mouse pointer to use, making the controls very easy to adapt to.
The visuals are simple yet pleasant to look at as it mostly uses colour and basic shapes to show what objects are what, making it easy to understand the objects from a gameplay perspective. The music complements the gameplay well and the sound effects give the player's actions more impact. However, I do wish the game made more use of the theme.
Overall, I enjoyed this game and it was very satisfying to win at the end!